Diagnostic Aids

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The catalyst test may abort due to a change in the engine load. Do not change the engine load when a catalyst test is in progress.
Certain conditions may cause a catalytic converter to degrade. These conditions may include an engine misfire, high engine oil or coolant consumption, retarded spark timing, a weak spark or lean fuel system.